Abstract: An electromagnetic signal processing system (10) comprises a plurality of optical fiber arrays (11, 12, 13, 14, 15 and 16) each having a cluster of optical fibers with their one ends (40) oriented to receive electromagnetic radiation from free-space, or to transmit electromagnetic radiation into free-space. Received electromagnetic radiation passes through respective array outputs (21, 22, 23, 24, 25 and 26) and optical delays (50, 51; 55, 56; 65) to the input (68) of a signal detector (69). Transmitted electromagnetic radiation from sources (71, 72) passes through optical delays (50, 51; 55, 56) to array inputs (21, 22, 23, 24, 25 and 26) so that the one ends (40) of the optical fibers transmit the electromagnetic radiation into free-space.

Abstract: A signal processing system (10) has a plurality of optical fibers (40, 42, 43) with their one ends (40) mounted in an array board (41) to receive electromagnetic radiation. A coupler (54) interconnects the other ends of the optical fibers (42, 43) in parallel such that electromagnetic radiation is first coupled together and then directed into two or more independent processing channels (45, 47).

Abstract: An optical fibre core (39) having a reflective coating (33) along a first part of its length such that electromagnetic radiation may travel along the first part of the optical fibre by means of reflection, and further having a cladding (37) along a second part of its length, the cladding having a refractive index suitable for permitting the electromagnetic radiation to travel along the second part of the optical fibre.

Abstract: A laser-radar receiver comprising an array of optical fibers, wherein the opposite ends of the optical fibers are connected to at least one electromagnetic radiation detector, each of the optical fibers having differing physical characteristics which result in known delays in the transmission time of pulsed electromagnetic radiation.

Abstract: A laser-radar receiver comprising an array of optical fibers, wherein the opposite ends of the optical fibers are connected to at least one electromagnetic radiation detector, each of the optical fibers having differing physical characteristics which result in known delays in the transmission time of pulsed electromagnetic radiation.

Abstract: An electromagnetic radiation (EMR) multiple pulse generator, comprising, an EMR source for producing discrete pulses of radiation, an EMR splitter for receiving the pulses of radiation produced by the EMR source, said splitter providing a plurality of EMR transmission paths for the received pulses, each of said transmission paths having physical characteristics for modifying EMR pulses passing through said paths relative to the input pulses, an EMR combiner for combining the modified outputs of said plurality of EMR transmission paths, and at least one combined EMR output transmission path for transmitting said combined EMR output.

Abstract: Apparatus for directing electromagnetic radiation (EMR) comprising an EMR source for producing discrete pulses of radiation, an EMR splitter, the EMR splitter providing a plurality of EMR transmission paths for received pulses, the EMR transmission paths terminating in an array, and optical means for receiving EMR emanating from the array and for directing said EMR.

Abstract: A system for tracking a projectile utilizing a laser beam modulated by an acousto-optic cell. Transponders distributed on hemispheres around the rear of the projectile detect the scanned beam and actively transmit a narrow optical beam back to a ground-based receiver in response to a detection of the scanned beam. IFF information can be modulated onto beam actively transmitted from the transponder. The system provides active two-way communications with comparatively simple components.

Abstract: A laser-radar receiver comprising an array of optical fibres, wherein the opposite ends of the optical fibres are connected to at least one electromagnetic radiation detector, each of the optical fibres having differing physical characteristics which result in known delays in the transmission time of pulsed electromagnetic radiation.

Abstract: A new adjustable container for providing a storage container whose volume may be adjusted to suit the size and amount of items held therein. The inventive device includes a base with a perimeter side wall extending around the base outer perimeter to define an interior space. The perimeter side wall has a height (defined between the terminal edge of the perimeter side wall and the base) which is adjustably extendible to increase or decrease the volume of the interior space. A removable lid is provided for substantially covering the opening into the interior space.

Abstract: An optical communications system which facilitates rapid establishment of communications between two stations (1, 2). The system uses acousto-optic cells (5, 6) for scanning and frequency modulating a laser beam. The frequency shift introduced by the cell (6) is indicative of the direction of arrival of the beam at a remote station (2). By detecting the shift, the relative positions of the two stations (1,2) may be deduced. The invention is suitable for use with secure communication systems and IFF systems.

Abstract: Apparatus for launching a projectile which has a nozzle for emitting gas during launch, said apparatus comprising means for supporting a projectile and a chamber having an orifice positioned to receive some or all of a jet from the projectile nozzle wherein the chamber is configured so that pressure is developed therein to provide an additional boost to the projectile during launch.